613631 has 4 divisors (see below), whose sum is σ = 617352. Its totient is φ = 609912.

The previous prime is 613609. The next prime is 613633. The reversal of 613631 is 136316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-613631 is a prime.

It is a super-2 number, since 2×613631² = 753086008322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 613631.

It is not an unprimeable number, because it can be changed into a prime (613633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1601 + ... + 1946.

It is an arithmetic number, because the mean of its divisors is an integer number (154338).

2⁶¹³⁶³¹ is an apocalyptic number.

613631 is a deficient number, since it is larger than the sum of its proper divisors (3721).

613631 is a wasteful number, since it uses less digits than its factorization.

613631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720.

The product of its digits is 324, while the sum is 20.

The square root of 613631 is about 783.3460282659. The cubic root of 613631 is about 84.9772026521.

Adding to 613631 its reverse (136316), we get a palindrome (749947).

The spelling of 613631 in words is "six hundred thirteen thousand, six hundred thirty-one".